Beneficial Effects of Synchronous Laser Irradiation on the Characteristics of Cold-Sprayed Copper Coatings

Abstract

Cold spray (CS) is an emerging materials deposition technique in which metallic particles are accelerated to a high velocity in a supersonic gas flow and then impinged onto a substrate to form a coating at a temperature well below the melting point of sprayed materials. The coating microstructure and properties are greatly influenced by particle preheating and substrate softening. This article presents a study of CS process of copper powder, with assistance of synchronous laser irradiation. The influence of synchronous laser irradiation on the Cu coating characteristics was investigated. The results show that the coating surface with laser irradiation is smoother than that without laser irradiation. The peak coating thickness is increased by about 70% as synchronous laser irradiation is employed, indicating an improvement in deposition efficiency. It is also found that with synchronous laser irradiation the coating is denser and the coating-substrate interfacial bonding is better as compared with that without laser irradiation. Moreover, the EDS and XRD analyses find Cu oxidation occurrence in the SLD coating, but the oxide is trivial. The aforementioned improvements on the coating largely arise from particle preheating and substrate softening by synchronous laser irradiation in the CS process.

Microstructure and tribological performance of tungsten carbide reinforced stainless steel composite coatings by supersonic laser deposition

“…Thus, the chemical composition and phases did not change in the SLD coatings with comparison to the CS coating, even for the low-melting materials such as Al, Cu. It was found in our previous study [29] A C C E P T E D M A N U S C R I P T…”

Research progress of supersonic laser deposition technology

“…This reduction in capital and operating costs means that SLD may be viable in many applications, for which CS has proved too costly allowing the fully solid process route found in CS to find a use in a wider range of applications. A variety of material coatings such as Cu, Ti, Stellite 6, Ni60, Al-Cu and Al-Si alloys, have been successfully prepared with SLD technique [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Microstructure and wear-resistant properties of WC/SS316L composite coatings prepared by supersonic laser deposition

“…лгдн использовали для нанесения покрытий из разнообразных материалов, таких как сu, Ti, Stellite 6, Ni60, сплавы Al-Cu и Al-Si и т. д. [7][8][9][10][11][12].…”

“…таким образом, химический и фазовый состав в покрытиях во время процесса лгдн по сравнению с гдн не изменялись даже при работе с материалами с низкой температурой плавления, такими как сu и Al. в наших предыдущих исследованиях было обнаружено, что окисление покрытий, полученных лгдн, является обычным фактом и его можно игнорировать при сравнении с медными покрытиями, полученными гдн [9]. Относительно низкая температура нанесения в про- цессе лгдн может эффективно избежать высоких термических напряжений, окисления, фазовых переходов и роста зерна в нанесенных покрытиях, что делает ее технологией нанесения покрытий, превосходящей газотермическое напыление и лазерную наплавку.…”